Camera



Aug. 8, 1950 L. W.'GACKI EI'AL 2,517,781

CAMERA Filed Sept. 5, 1945 7 Sheets-Sheet 6 INVENTORS fo/mpo 14/ 6340/0 A TORNEYS Patented Aug. 8, 1950 CAMERA Leonard W. Gacki and Carl J. Brasser, Jamaica,

N. Y., assignors to Fairchild Camera and Instrument Corporation, Jamaica, N. Y., a corporation of Delaware Application September 5, 1945, Serial No. 614,538

3 Claims. (01. 250-65) This invention relates to a camera, and more particularly to a camera for use in connection with a fluorescent screen to photograph X-ray images thereon.

In recent years it has been found desirable, and in various instances necessary to photograph the result of X-ray or fluoroscope surveys of large groups of people, particularly in connection with diagonsis and treatment of potential tuberculosis cases. Many problems were encountered in carrying out this work by reason of the shortcomings of the available photographic equipment which was but indiiferently adapted for use with the X-ray apparatus. The conventional, i. e., hospital type of equipment, was found unsuitable for survey work because of its massiveness, slowness of operation, individual plates or cut films, and inconvenient picture size, rendering classification and storage of the negatives diiiicult. On the other hand, where very small cameras, i. e., 35 mm. cameras, adapted to this type of work were used, the results were in many instances unsatisfactory because the small images failed to indicate certain conditions which would have been apparent on larger sized film. Then too, regardless of the size of camera used, it would not infrequently happen where strip film was used that some of the first individuals of a group, and occassionally a few at the end of the group, were not photographed by reason of the fact that the film strip was not in proper position with respect to the camera aperture, or had become exhausted. Still other difliculties were encountered in lack of synchronization between thejcamera and the X-ray equipment, rendering the film changing portion of a cycle of operation slow and uncertain.

It-is accordingly among the objects of this invention to provide a strip film camera for use withX-ray equipment which obviates the above difiiculties as well as others. It is a further object to provide a camera of the above nature which is completely automatic in operation, so as to be able to take a large number of successive photographs without the necessity of reloading thej camera with unexposed film. It is still another object of the invention to provide a camera of the" above nature which is substantially foolproof in operation, so as to preclude the possibilit of apparent exposure operation when there is no film in exposure position. Other objects will ,be in part apparent and in part pointed out hereinafter.

In the drawing, wherein there is shown one form of our invention,

Figure 1 is a perspective view of the camera; Figure 2 is an enlarged fragmentary side view of the mechanism by which the film magazine is attached to the camera body; Figure 3 is an enlarged fragmentary side view of the camera, as viewed in Figure 1, with the side cover plate removed to show the driving mechanism; Figure 4 is an elevation of the right-hand side of the camera body as viewed in Figure 1 with the film magazine removed, a portion being broken. away and shown in section; 7 Figure 5 is a sectional elevation of the camera magazine taken along the line 55 of Figure 6; Figure 6 is a horizontal section taken along the line 6-6 of Figure5;

Figure 7 is afragmentary perspective view of a portion of the film magazine showing the mechanism for controlling the pressure plate;

Figure 8 is a schematic perspective view showing the-camera,incombination with the X-ray apparatus; and, Figure 9 is a wiring diagram of the control circuit of the camera.

Referring first to Figure 1, the cemera comprises a body generally indicated at H), and a film magazine generally indicated at H, which is detachably connected to the camera body by latching mechanism generally indicated at l2. Camera body It) has formed or attached to the side thereof a housing I 3 in which is disposed certain driving and control mechanisms dew scribed indetail hereinafter, which are normally covered bya cover plate [4. The camera. body also includes an upper housing I5 within which is disposed the driving motor of the camera, and

also a flanged aperture I6, to the flanges ll of which the fluorsecent screen housing may be attached, as will also be described hereinbelow. Magazine II is of the type capable of holding a substantial length of strip film, e. g., '70 mm. film which is automatically fed by increments.

As is better shown in Figure 5, magazine Ii includes a base I8 and a cover 19, to which is fastened a handle 20 (Figure 1). At the opposite sides of the upper end of base l8 are secured a pair of lugs 2|, which support an attaching rod 22 adapted to be received in bifurcated brackets 23 fastened to camera body In when magazine H is attached to the camera body. As is better shown in Figure 2, at each side of the lower right-hand end ofcamera body I0 is fas tened a plate 24 which projects below the camera body and carries a stud 25 forming a pivotal attachment for a latching arm 26. To this arm is secured a pin 27 which constitutes an anchor for one end of a spring 28, the other end of which is fastened to a pin 29 secured to and projecting from plate 24. Latching arm also carries an inwardly projecting latching pin adapted to engage behind a latch plate 3| fastened to the lower part of magazine base plate I8, the pin and latch thus holding the magazine securely to the camera body when in the position shown in Figure '2. As noted above, the other side of camera body Ill includes latching mechanism similar to that just described.

Latch plate 3! includes a cam surface '32 which rides against. latch pin 3%) when the magazine is being installed, forcing the pin and accordingly arm 26 downwardly against the bias of spring 28 until the pin underr'ides the bottom of the latch plate, whereupon spring 28 swings arm 26 counterclockwise so as to engage pin 30 behind latch plate 3|. 'Thus it follows that the axis of rotation of the camera magazine during its attaching movement is displaced a substantial distance from the center of mass of the magazine in the direction of its locking movement so that the magazine readily falls into its secured position where "it tends to remain against inadvertent displacement by reason of the offset of the said axis of rotation from the center of mass. Furthermore, with reference to Figure I, wherein the camera is shown in its operative position, the disposition of rod 22 at the top of the magazine renders installation thereof on the camera bod not only easy, but also relativelycertain in spite of the rather substantial weight of the loaded magazine.

Referring now to Figure 3 a driving motor is mounted partially in camera body In and partially in housing is in any suitable manner, and is connected byway of reduction gearing 34 to a clutch generally indicated at 35. This clutch is preferably of the conventional spring and ratchet type such, for example, as is disclosed in the 'Weiblen et al Patent No. 2,131,926, and accordingly includes a ratchet 36 which, when engaged by a pawl 31, results in disengage'rnent of the clutch. 'When the ratchet and pawl are disengaged, the clutch is engaged and accordingly a shaft 38 to which the driven element of the clutch is secured, is rotated. One end of this shaft 38 is rotatably mounted in a suitable boss 39, formed in the camera body, while the other end thereof carries a coupling 80. Also secured to shaft 38 is a worm 4| which meshes with a worm wheel 42 secured to, so as to rotate a shaft '43, which is 'rotatab'l'y mounted in the mechanism housing I 3 in "any suitable manner. Also fastened to shaft 43 is a cam 44 which, as will be described hereinafter, controls the film magazine pressure plate by which the film is firmly and flatly held in proper exposure position in the focal plane during exposure.

I Pawl 37 is formed on the end of a bar-A5 which is slidably attached to a side Illa (Figure 4) of the camera body as by a pair of screws 46 and 149. on the other end or bar W5 is an ear '50, which is pivotally attached as by a pin 5! to one end of a lever '52 fulerumed on a pin 53secured to a lug 5! extending from camera body side ma. The other end of lever 52 is biiur oated to straddle a in fastened in the slotted end 56 of a rod '57, this rod forming a portion of the armature of a solenoid 58. it may now be seen that when solenoid 58 is energized its armature and accordingly rod 51 is "drawn to the left, as viewed in Figure '3. This "movement of the rod pivots lever 52 clockwise, as viewed in Figure 4, and accordingly draws slide bar to the right, thus disengaging pawl 31 from ratchet wheel 36, causing clutch 35 to engage. This, as noted above, permits motor 33 to drive shaft 38, and accordingly operate the film magazine, as willbe described below.' I

Cam 44' (Figure 3) operates abell crank 59 pivotally mounted on a pin 69 through engagement with a follower Bl carried by one arm 62 of the bell crank. A spring 63 is fastened at one end to hell crank arm 62, and at the other end to 'a stationary pin 64 which constantly biases the bell crank 59 clockwise, and accordingly holdsits follower 61 in engagement with the periphery of cam 44. The other arm 62a of the-bell crank is pivotally connected to the lowor end of a rod 65 slidably mounted in a guide between walls 715 and I boss the upper end 6'! of this rod controls the film magazine pressure plate. It should be noted at-th-is point that bell crarilcil'l includ'es'an ear '68 which carries a 'pin 69, which: pin, whenthe bell crank is in the position "shown, throws a switch 10, for a purpose to be described. When, however, the bell crank follower 61 falls into portion 44a of the cam; pin 69 is withdrawn from the plunger of switch 10, the switch thus being thrown in the opposite direction, as will be described in more detail below.-

As shown ini i'gure 4, camera body it is provised a side "plate ii in which formed an aperture past which the film is fed when the magazine i attached to the'body. The camera magazine as shown in Figure 5 includes an upwardly extending flange 73, which flange, .as shownin Figure 6, is provided with a g'roovea'l. that extends around the four sides of the inaga= zine base to provide" a light-tight seat for magazine cover i9 (Figure 5). Secured to and extending upwardly from magazine base iii are spaced wallser' partitions l5 and 1%, and these plates rotatably support film spool spindles i7, i8, and 33, the latteroiwhich is fastened'to one end of a stud shaft Bl which extends through a boss 22 in wall is and-has fastened to its other end a wcrin'wheel so, by which the said shaft 84; and accordingly the spindle so, is driven. Spindies 78 and to receive a take-up spool as (Figure 5) while the other pair of spindles carry a film supply spool 35 from which the film is fed over 'th'e focal plane and pasta suitable aperture therein, to be rewoundon spool '84. In beingffed fro e' spool to anotherfthe 'filmpasses under olls-rile are 6) rotatably"inounted iifthence under. a pres sure plate generally'indioa' ted at 81, then under a metering roller 88 beneath'pi'e'ssure rollers :29 which tightly press the film against roller is. rollers 88 and 89 the film then passes 'to" take-up spool 8 (Figure 5) to which it is attachedin the coni' ention'al manner. It might here be noted that thesha'ft 85a on which roller 86 is mounted extends through Wall 16, and has atshaft 93, the upper end of this shaft being 'rotat ably supported in a boss 94 forming an integ'ral'part of plate To the lower end of shaft 93 is fastened a female coupling 95 which, when the magazine and camera: body are secured together, mates with coupling 4 8 (Figure 3) to pro- 'vide a driving connection from motor 33 to shaft 93 (Figure This shaft 93 also carries a pair of worms '96 and 9 the former of which meshes with a worm wheel 98 secured to a shaft so, on which metering roller '88 is mounted, and the latter of which meshes with worm wheel 83. Worm c1, however, is slidably mounted on shaft 93 so as to be able to move axially thereof, being biased upwardly, however, by a spring we, so that a friction plate lfli at the top of the worm is forced into engagement with a complementary focus plate or disc ace secured to the upper end of shaft 93. Thus it may be seen that worrn 9'! is driven through the friction discs I35 and I232 when the friction there between exceeds the load on take-up spool M. It accordingly follows that the take-up spool is driven intermittently, i. (2., only when there is slack film between it and the metering roll, thus to accommodate the varying diameters of the film supply and take-up spools.

As noted hereinabove, a pressure plate 8? is provided. This plate is located over an aperture 193 in the magazine base l8, and this aperture, of course, registers with aperture 12 (Figure 4) in the camera body when the magazine is attached thereto. At all times, except when fresh film is being wound from the supply to the take-up spool, pressure plate 81 is down, i. e., is pressing the film firmly against magazine base l8 over aperture 263 to hold the film in a smooth, fiat condition to avoid distortion. The pressure plate is thus pressed by means of cam d4 (Figure 3) bell crank 59 and rod 65, by mechanism now to be described.

As shown in Figures 5, 6 and 7-, the pressure plate has secured thereto four upstanding posts Hi l, the upper ends of which are reduced (see Figure 5) as at W ld, and extend upwardly through feet ltd carried at the bottom of a par of bifurcated brackets I95 and 19? which are :respectively secured to side plates "iii and Each of posts Hi4 carries a coiled spring 168 coiled around the reduced portions of the posts and lying below feet 105 so as to impart a constant downward bias to pressure plate '81. plate '81 also has secured thereto a plate i853 (Figure 6) provided with upstanding flanges III] and ill at the opposite ends thereof, To the former of these is pivotally fastened one end of a lever M2, the other end of which is secured to a collar H3 which is pinned to a shaft lid. The opposite ends of this shaft are rotatably mounted in brackets its and I 01, end IMa of the shaft extending through the bracket and through plate 16. This end of the shaft has fastened thereto one end of a lever lid, this lever being secur d to plate bracket iii by a pin lit which extends irom the lever through a hole .I III (Figure 5) formed in side plate "it. A spring H8 has one of its ends fastened to lever H5, and the other anchored to a post H9 secured in plate T6, and

this spring constantly biases the lever clockwise,

as viewed in Figure 5, thus t hold a foot its, which is a part of the lever, against the top or pin or plunger l2], reciproc'ably mounted in a bushing i2 2 carried bymagazine base 18. This plunger 52! registers with the outer end bl (Fig ure 3) of rod '65 and accordingly completes the connection between cam M and pressure plate 87. Thus it may now be seen that when cam 1 is rotated, so as to force follower 61 out of cam portion E la, bell crank 59 is rocked counterclockwise, as viewed in Figure 3, and rod "85 is pro- 'jected upwardly, as viewed in this figure. This movement of the rod is imparted to plunger I21 Pressure (Figure 5) which is, in turn, forced upwardly, as viewed in this figure, to rock lever H5 counterclockwise. This, in turn, rotates shaft H4 counterclockwise (see also Figure 6) so that lever H2 is lifted. Thus both levers I I2 and H5 are rocked away from the focal plane, and as these levers a'e connected to the pressure plate, the plate is in turn lifted away from the focal plane against the pressure of springs 56 .3 (Figure 5) thus to permit free passage of the film beneath the pressure plate.

In order to facilitate threading new film beneath the pressure plate, we have provided a rod 523 reciprocably mounted in a guide G24 (Figure 6) which extends outwardly from side plate 76. The lower end of this rod (see Figure 5) is slotted as at l 25, and through this slot extends the free and a of lever M5, the bottom of the slot in red l23 being closed by a pin E25. Rod l23 also has fastened thereto a coilar l2? between which and guide i24 is disposed a spring 128 coiled around rod I23 and accordingly constantly bias-- ing'the rod upwardly, as viewed in Figure 5. The upper end 23a of the rod bears against a U- shaped bracket i253 fastened to the underside of magazine cover i9. It may now be seen that when cover 59 is in position on the magazine wherein it is held by a thumb screw I35, bracket 29 forces rod E23 downwardly and accordingly moves the pin 52%; at the bottom of the rod away from lever iii, thus to permit free movement of the lever. When, however, the magazine cover is removed, and rod iii-i is relieved of the restraint of bracket E29, spring forces the rod upwardly, as viewed in Figure 5, so that pin 226 engages beneath lever H5 and rocks the lever counterclockwise, thus to lift pressure plate 8! from its seat in the manner hereinbefore described. Thus it may be seen that the pressure plate is automatically lifted away from its seat when the magazine cover is removed, thus greatly facilitating the installation of unexposed film.

The entire cycle of operation is constituted follows: After an exposure, during which the pressure plate is seated, and follower 6! (Figure 3) is in cam portion Ma, motor 33 is automatically energized in a manner which will be de scribed, and at the same time clutch 35 is engaged by reason of the simultaneous energization of solenoid 53. Accordingly, shaft 38 is driven to cause rotation of cam 44. This immediately rocks bell crank 59, and in the manner hereinbefore described, raises the pressure plate from its seat. Also, shaft 93 (Figure 5) is driven so that metering roll 88, as well as the film take-up spool 584, are rotated. The metering roll draws film from the supply spool beneath the raised pressure plate, the being wound. on the take-up spool 86 until sufficient film has been fed to properly position an unexposed portion over the camera aperture. At such the motor circuit is automatically broken by switch it (Figure 3) and all mechanisms come to rest, the pressure plate again being seated to hold the film flat in the focal plane.

As noted hereinbefore, the camera described is adapted for use in connection with X-ray equipment. As shown in Figure 8, the camera which is generally indicated at C is attached as by its mounting flange iii to a cone or hood 5-4!) which includes a fluorescent screen Ml. An operators switch box or control hi2 is electrically connected as by cables S43 and M4, respectively, to the camera and to an X-raytube M5. When the switch in the control box M2 is turned on,

tube I45 is energized so as to emanate X-rays, which are projected on screen I lI which fluoresces. At the same time the camera photographs the image on the fluorescent screen. When the exposure has been made and current to tube I4 5 has been turned off, the camera is automatically operated by a system of relays generally indicated at R, and described hereinbelow, to cause the exposed portion of the film to be moved out of, and a succeeding portion of unexposed film to be moved into exposure position.

In the wiring diagram shown in Figure 9, that portion of the control circuit including the relays R which are housed in the camera body II! are on the left of the vertical dot-dash line L, while that portion of the circuit which is at the magazine lies to the right of the line L. A socket I55 has connected thereto leads I41, I48, I49, I50 and I5I, leads I41 and I48 being connected to a source of current when the cable I43 (Figure 8) is plugged in. These two leads are also connected respectively to a pair of contacts I52 and I53 on the camera body which engage with a pair of contacts I55 and I55 on the magazine when the magazine is attached to the camera body. It follows that if the magazine is not on the camera body, or is improperly positioned thereon, the circuit including leads Hi1 and I68 cannot be completed. Hence it is impossible to operate the camera if the magazine is not in proper operative position thereon. Furthermore,'connected to contacts I54 and I55 are a pair of leads I55 and I51 which are connected to opposite sides of a switch generally indicated at I58. This switch may be of the type shown in Petit et al. 1,963,095, and accordingly is designed to complete the circuit, which includes a signal light I59, when there is 'live film in proper exposure position in the magazine.

Lead I49 is connected by way of cable I43 (Figure 8) to control box I42, and transmits power therefrom when a push button I420; is pressed. Lead I59 (Figure 9) is connected by way of cables I43 and I44 to X-ray tube I45 to transmit power thereto for energization of the tube. Lead I5I is connected by way of cable I43 to a film indicator light I69 on the control box I42, and this light blinks intermittently as flasher cam 90 (Figure 9) intermittently opens and closes switch 9|, the circuit through the switch including a lead IBI connected to contact I55; a lead I52 connects the other side of the switch to a magazine contact I63 which, when the magazine is on the camera body, mates with a contact I 64 to which lead I5! is connected.

The power circuit which includes leads I 41 and I48 preferably includes a main switch (not shown) which may be located in any convenient position, for example, the switch may be included in control box I42 (Figure 8) and accordingly when closed completes the circuit, including lead I41 and I49, assuming, of course, that the magazine is in proper position and switch I53 is closed.

Relays R (Figure 8) include relays I65, I 66 and I 51. Relay I 55 is connected at one side by a line I58 to lead I48, the other side of the relay being connected by a line I99 to a lead I19, this latter lead being connected to one of a pair of stationary contacts 190. and 19b of switch 19. When cam 44 is in the position shown, a movable contact 190 of switch 19 engages stationary contact 19a, the movable contact being connected by a line I1I to lead I41. Thus with leads I41 and I48 energized, a circuit through relay I 65 is completed. Relay I65 controls a pair of switch arms I12 and I13,con-nected respectively to leads I14 and I15, the former being connected to lead I1I, while the latter is connected to the other stationary contact 191) of switch 19. Lead I15 is also connected by lead lit to one side of'motor 33 and to one side of the clutch release solenoid 58, the other sides of these two elements being connected by a lead I11 to line I48.

Relay I55 is connected by a lead I18 to line I48 and by a lead I19 to a wire I95, the opposite ends of this wire being connected respectively,- to a switch arm Isl and a terminal or contact I82.

Relay I51 is connected at one side by a lead I83 to line I51, the other side of this relay being connected to lead Hi9 which, as noted above, is connected to thepush button in control box I42 (Figure 8). Relay I51 (Figure 9) controls a pair of switch arms I84 and I85 which, when the relay is energized, engage contacts I89 and I82, respectively. When relay I51 is deenergized, these switch arms respectively engage contacts I81 and I88. Switch arm I3 4 is connected to lead I19, while switch arm I35 is connected by a lead I99 to leads I99 and I9I, respectively connected to contacts I92 and 193. These contacts are respectively engaged by switch arms I12 and I8I when relays I55 and I99 are energized.

Contact I88 is connected by a lead I94 to a contact I95, which is engaged by a switch arm I95 when relay I 56 is energized. When this relay is deenergized, arm I99 engages a contact I91. Switch arm I95 is connected by a lead I98 to a contact 199, which is engaged by switch arm I13 upon energization of relay I95. When'relay I65 is deenergized, switch arm I13 engages a contact 299.

In operation, when the main switch is turned on, lines I 51 and I 38 carry power to energize relay I95 which, as noted above, is connected across the power lines. Nothing further, however, happens until push button M1266 in control box I42 is depressed. When this occurs a circuit is completed through relay I51 and switch arms I84 and I35 are drawn against contacts I86 and I82, respectively. It should also be noted that energization of relay I55 resulted in switch arms I12 and I13 being engaged with contacts I92 and I99, respectively. With the several switch arms thus thrown, the following circuit is established: power line I41, lead I'II, lead I15, switch arm I12, contact I92, lead I99, lead I59, switch arm I95, contact I82, lead I85, lead I19, relay I95 and lead I18 to the other side of the circuit, i. e., to line I43. Thus relay is energized so that its associated switch arms IBI and I99, respectively, engage contacts I93 and I95.

The several relays and switch arms will remain in this condition until push button I42a (Figure 8) is released to break the circuit including line I49, and accordingly deenergizing relay I51. With relay I51 thus ultimately denergized, i. e., after the exposure period, its switch arms I84 and I85 move to the position shown in Figure 9. With the arms in this position, the following circuit is established: line I48, lead I11, motor 33 and clutch release solenoid 58, line I16, line I15, switch arm I13, contact I99, line I98, switch arm I95, contact I95, line I94,-contact I 86, switch arm I85, line I39, line I99, contact I92, switch arm I12, lead ill to line I91, completing the circuit through the motor and clutch solenoid to efiect energization thereof. With these elements thus energized, cam 44 starts to rotate as hereinbefore explained, and in a clockwise direction, as indicated by the arrow. Immediately I84 and I35 w th contacts I86 and i825, respectively, a power circuit to the Xi-ray'tube .l' 15 (bigure 8) is established as follows: 'lineii' ll, lead I1 I, switch arm IIlc, switch contact Ilia, lead iiEl, switch arm I84, contact I88 and lead I59. This circuit, is of course, broken when rela 161 becomes deenergized upon releaseof the push but- :ton,,which causes switch arm 184' and contact I86 to separate;

- Relay I06 might be termed a holding relay, and

remains energized subsequent to deenergization otreiay I61. The holding-circuit maintaining relay I68 energized isvas .follows: line I48, lead I'I8-, r elay I66, lead'Il9. -lead I80, switch arm Isl, contact I9$, l ead Isl, ead I90, contact I92, switch arm I72, lead I'M and lead ill to line Ml.

As soon as cam 34 begins to rotate, switch arm 16c isforced out of engagement with contact Ida and into engagement with contact itb. The disengagement of the switch armand contact Illa breaks the circuit 'to relay I65 thuseffecting de- 1 energization of this relay to cause arms H2 and I13 to'return to the positionshown in the wiring diagram. When arm Ii2 thus disengages contact I92, the circuit through :holding relay Hit is broken and this relay accordingly becomes deener ized. v. I

However, disengagement of armII3 from contact I99 does not result in deenergization of motor 33 or clutch solenoid 58, as a new circuit for these elements is established upon engagement. of switch-arm= l flc 'with'contact lab as follows: power line I47, lead I'II, switch arm 70c, switch contact 10b, lead I15, lead I76, motor 33 and solenoid 58, and lead IT! to line MB. This circuit, of course, is maintained until cam 4 completes one revolution, i. e., until the follower 6| drops into cam portion 44a, thus to break the newly established motor circuit. However, reengagement between switch arm inc and switch contact la does not at this time establish a circuit to motor 33 and clutch solenoid 58, as this circuit cannot be reestablished until relay I6? is against energized. Of course, reengagement of switch arm Tile with switch contact 16a reestablishes a circuit through relay I65, as this is prerequisite to conditioning the first motor circuit for completion upon energization of relay I67. It accordingly follows that both the camera and X-ray equipment can be operated automatically and in foolproof manner from a position remote from the equipment, thus not only saving substantial time between successive exposures but also safeguarding the operator from X-ray burns.

As it is occasionally necessary or desirable to advance the film without making an exposure, a manually operable switch 2M is connected to leads "I and I16, and accordingly when this switch is closed, motor 33 and solenoid clutch 58 are energized without, however, afiecting any other portion of the circuit or the X-ray equipment.

It will now be seen that there has been provided an X-ray camera and system by which the several objects hereinbefore mentioned are ac- 10 .complished in an entirely practical and efiicierit manner. As many possible embodiments may be made of the above invention, and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

I What is claimed is:

r 1. In apparatus of the character described, in combination, an X-ray tube, a fluorescent screen, a camera associated with said screen to photograph images appearing thereon, said camera in cluding a supply of sensitized film, a body, a detachable magazine and a film winding motor, 'a circuit including a source of power for said X-ray tube, a normally open motor circuit, means responsive to energization of said X-ray tube circuit for conditioning said motor circuit for subsequent energization, means responsive to deenergization of said X-ray tube circuit for energizing said motor circuit, means operable to prevent motor operation until said X-ray circuit has become deenergized, motor operated means for rendering said preventing means effective, a visual indicator, 9, switch having open and closed positions and responsive to the presence of film positioned for exposure in said camera, an indicat-or circuit connecting said visual indicator and said switch for energizing said visual indicator in accordance with the positioning of said switch, a-first set of electrical contacts in fixed position on said body, a second set of electrical contacts on said magazine and adapted to be aligned with and in contact with said first set of contacts when said magazine is in a predetermined position relative to said body, a protective circuit including said contacts and said power circuit for per mitting energization of said power circuit when said magazine is in said predetermined position, a visual blinker indicator, and a blinker circuit for causing said blinker indicator to flash oh and on during the time said film in said camera is in motion.

2. A control circuit for a camera having a shutter and a roll film magazine for taking successive X-ray pictures, in combination, a first relay connected across a pair of power lines so as to be energized thereby, a main switch connected across said lines to effect energization of said relay when closed, a second relay connected across said power lines, an X-ray switch in the circuit of said second relay adapted when closed to effect energization thereof, a third relay connected across said power lines, switch means in the circuit of said third relay and operatively associated with said second relay and adapted to be closed upon energization of said second relay, thereby to energize said third relay, means forming a holding circuit including closable switch means operatively associated with said third relay adapted to be closed when said third relay is energized, said last-mentioned switch means including a portion associated with the circuit of said third relay and adapted to maintain said third relay energized when closed, whereby said third relay continues to be energized when said first-mentioned switch means open upon deenergization of said second relay, an electric motor connected to said holding circuit and energized when said second switch means is closed, a cam connected to said motor so as to be driven thereby, and a switch operatively associated with said cam, said switch including a contact in the circuit of said first-mentioned relay women 1 1 which iscIosedwhensaidcam' is in its'ies't pufiition, said last-mentioned switch including another contact forming a part "of an auxiliary holding circuit for *said =mo'tor, said second contact "being engaged during rotation of said cam *thereby to energize the second holding circuit for said motor, said first-mentioned holding *circuit including switch means operatively associated with and adapted to be closed Wi son-"energization of said first-mentioned relay, saidfirstmentioned switch contactbeing disengaged *when said second-mentioned 'contact is engaged, whereby the circuitto said first-mentioned'reiay 'is brokenand said last--menti0m:d switch means are opened to break said first-"mentioned holding 'circuit for said motor.

Acontrol circuit for'a-camerahaving'a shiitter and-a roll film magazine for taking'succes'sive X-ray pictures, in-combination, a first 'relay connected across 'a air -'of power lines so as to be energized thereby, a=main switch-connecteda'cross saidlines toeffect energizationof saidrelay when closed, a'secondrelay connected acrcsssaid power *linesan X-ray switch inthecircuit'of said second relay adapted when closed to efiect *energizati'on thereof, a-third relay connected-across said power lines, switch means in the circuit of said third *relay and operativly associated with :said second relay and adapted to be 'close'dupon energiza'tion of said-second relay, thereby-to energize said third relay, means forming a holding circuit including =ciosable switch meansoperatively-associated"with said third relay adapte'dto be closed when said third relay is "energized, said last-mentioned switch-means includingaportion associated with the cir'cuit of said third relay and adapted to maintain said third 'relay energized when closed, whereby said third relay continues to he 'ener gized when said first-mentioned switch means open upon deenergiza'ti'on of said second relay, an electric motor-connected to said holding circuit and energized'wh'ensaidsecond switch means :azcam mooted maid mrotor eso as itn he dzivenziiherebygaeswiischmperativelyassociated with said mam,:saiid switch moiuding a contact in the :circnit 501' isflfid first-mentioned welay which :is closed :said mam ii-n rest osition, said :last-ancntioned :swltdh including another montact a apart mi =-auxiliary molding cincuit motor, second contact beengaged during mutation zof said *ca-m' thereby :to :energize :second molding oi-rou'it for said imotor, :said -zfinstementioned molding circuit inroperaizi-vely asseciated with and adapted to :he zclese'd upon energ'ization hi said first-mentioned arelay ssa'id first-mentioned switch contact dieing afiiscngaged when said secand-mentioned :cantact is engaged, whereby *the 'zciiacuitztoaaidifirst mentioned rlay is' brokeniand said last-mentioned switch means are wpened'tc :hreak :iirstememicned molding circuit ior saidanntcr, :and a clutch zoperating ssiiienoid mom :nected across so ito be energize-bis and -.cleenergjizahle'f.herewith. W W.

SITE!) i-Ihe following, references rare or record in gthe -fiie edf dihis ipaten't: 

